But a new study at one hospital finds that these devices may not always be worth the savings in water use.
但最近在一所医院进行一项研究发现，用这种水龙头节约水可能得不偿失。
Other attempts to produce devices that could use sunlight to split water have relied on corrosive solutions or on relatively rare and expensive materials such as platinum.
其它的利用太阳光分解水的方案依赖于腐蚀性溶液或者相对稀有且昂贵的材料比如铂合金。
Such devices can reduce the concentration of manganese by 60% to100% depending on filter use and the characteristics of the water.
一些装置依靠过滤器的应用和水的特性，能降低60%-100%锰含量。
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